Answer:
56
Step-by-step explanation:
I thibk
To reflect a function across the y-axis you have to change

So, the function becomes

We let f(0) = 235
After 1 month,
f(1) = 235*(0.7) + 50
After 2 months,
f(2) = 235*0.7*0.7+ 50*2
And so on..
Therefore, we can represent the number of MP3 players in the store after n months with the function:
f(n) = 235 (0.7)^n + 50n
Measure = 1/2 (120-30)
1/2(90)
45
Answer = 45°